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linux-next/arch/arm/mm/copypage-xsc3.S
Lennert Buytenhek 23bdf86aa0 [ARM] 3377/2: add support for intel xsc3 core
Patch from Lennert Buytenhek

This patch adds support for the new XScale v3 core.  This is an
ARMv5 ISA core with the following additions:

- L2 cache
- I/O coherency support (on select chipsets)
- Low-Locality Reference cache attributes (replaces mini-cache)
- Supersections (v6 compatible)
- 36-bit addressing (v6 compatible)
- Single instruction cache line clean/invalidate
- LRU cache replacement (vs round-robin)

I attempted to merge the XSC3 support into proc-xscale.S, but XSC3
cores have separate errata and have to handle things like L2, so it
is simpler to keep it separate.

L2 cache support is currently a build option because the L2 enable
bit must be set before we enable the MMU and there is no easy way to
capture command line parameters at this point.

There are still optimizations that can be done such as using LLR for
copypage (in theory using the exisiting mini-cache code) but those
can be addressed down the road.

Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2006-03-28 21:00:40 +01:00

98 lines
2.1 KiB
ArmAsm

/*
* linux/arch/arm/lib/copypage-xsc3.S
*
* Copyright (C) 2004 Intel Corp.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Adapted for 3rd gen XScale core, no more mini-dcache
* Author: Matt Gilbert (matthew.m.gilbert@intel.com)
*/
#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/asm-offsets.h>
/*
* General note:
* We don't really want write-allocate cache behaviour for these functions
* since that will just eat through 8K of the cache.
*/
.text
.align 5
/*
* XSC3 optimised copy_user_page
* r0 = destination
* r1 = source
* r2 = virtual user address of ultimate destination page
*
* The source page may have some clean entries in the cache already, but we
* can safely ignore them - break_cow() will flush them out of the cache
* if we eventually end up using our copied page.
*
*/
ENTRY(xsc3_mc_copy_user_page)
stmfd sp!, {r4, r5, lr}
mov lr, #PAGE_SZ/64-1
pld [r1, #0]
pld [r1, #32]
1: pld [r1, #64]
pld [r1, #96]
2: ldrd r2, [r1], #8
mov ip, r0
ldrd r4, [r1], #8
mcr p15, 0, ip, c7, c6, 1 @ invalidate
strd r2, [r0], #8
ldrd r2, [r1], #8
strd r4, [r0], #8
ldrd r4, [r1], #8
strd r2, [r0], #8
strd r4, [r0], #8
ldrd r2, [r1], #8
mov ip, r0
ldrd r4, [r1], #8
mcr p15, 0, ip, c7, c6, 1 @ invalidate
strd r2, [r0], #8
ldrd r2, [r1], #8
subs lr, lr, #1
strd r4, [r0], #8
ldrd r4, [r1], #8
strd r2, [r0], #8
strd r4, [r0], #8
bgt 1b
beq 2b
ldmfd sp!, {r4, r5, pc}
.align 5
/*
* XScale optimised clear_user_page
* r0 = destination
* r1 = virtual user address of ultimate destination page
*/
ENTRY(xsc3_mc_clear_user_page)
mov r1, #PAGE_SZ/32
mov r2, #0
mov r3, #0
1: mcr p15, 0, r0, c7, c6, 1 @ invalidate line
strd r2, [r0], #8
strd r2, [r0], #8
strd r2, [r0], #8
strd r2, [r0], #8
subs r1, r1, #1
bne 1b
mov pc, lr
__INITDATA
.type xsc3_mc_user_fns, #object
ENTRY(xsc3_mc_user_fns)
.long xsc3_mc_clear_user_page
.long xsc3_mc_copy_user_page
.size xsc3_mc_user_fns, . - xsc3_mc_user_fns